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Renault Scenic Power Loss Whistling Noise

Hi, I have a 2010 Renault Scenic, gasoline engine, with about 58000 km. Lately, the check engine light has been coming on, and I've noticed a significant loss of power. The engine response is terrible, and there's this whistling noise, almost like a loud hissing, when I accelerate. Sometimes it even stalls at idle, and my fuel consumption has definitely gone up. Any ideas what could be causing this? Could it be related to the turbo?

A 2010 Renault Scenic with a gasoline engine experienced power loss, a whistling noise during acceleration, and increased fuel consumption, accompanied by the check engine light. The symptoms suggested a boost leak, possibly due to a split hose or issues with the turbo wastegate actuator or pressure sensor connections. The problem was identified as a faulty electrical bypass valve on the turbocharger, which was repaired by a mechanic, resolving the issues.

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4 comment(s)

Sounds like you've got a boost leak somewhere. That whistling/hissing is a classic symptom. Is it possible it's a split hose somewhere? Have you checked the turbo wastegate actuator or any of the pressure sensor connections? It's also worth trying to feel around all the hoses for air escaping while the engine is running - carefully!

Thanks! I haven't checked those specifically. Where exactly are those pressure sensors located? Are they easy to get to without special tools?

Right, the pressure sensors are usually located on the intake manifold or on the turbocharger itself, or the intercooler piping. If you have no idea what you're doing, should you be fiddling with it? Given all the symptoms, especially the stalling, and the fact that it's a turbo engine, it really sounds like the electrical bypass valve on the turbocharger is defective. You should probably take it to a workshop. It's going to cost you around 250€.

Thanks for the advice! I took it to a local mechanic. You were spot on – faulty electrical bypass valve. Repair cost was indeed around 250€. Runs like new now!

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RENAULT

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SCENIC